.wrapper{
    position: relative;
    padding-top: @header-height;
    height:100%;
  }
  .header{
    height:@header-height;
    position: absolute;
    z-index: 99;
    top: 0;
    left:0;
    width:100%;
  }
  .content{
    position: relative;
    height:100%;
  }